Box stamping and drawing tool



May 10,1932.

F. EISENLOHR 7,628

BOX STAMPING AND DRAWING TOOL Filed Feb. '19, 1930 Patented May 10, 1932 UNITED STATES PATENT OFFICE,

FRIEDRICH EISENLOHR, OF CANNSTA'IT, GERMANY, ASSIGNOR TO BLECHDOSEN-UNI) PLAKATFABRIK K. G., OF CANNSTATT, GERMANY BOX STAMPING AND DRAWINGTOOL Application filed February 19, 1930, Serial No 429,783, and inGermany February 25, 1929.

The progressive mechanizing of work requires to-day packing boxes, theclosure of which is so shaped that a reliable and quick pasting over ofthe box edges is possible with the known bandarolling machines. For thispurpose it is necessary for the upper part of the box, where the lidengages, no matter whether the box be round or square, to be smaller indiameter by the thickness of the sheet metal, that is set off, anoperation which cannot be carried out on existing machines. Consequentlya device must be produced which enables the production of thisabsolutely cylindrical box, when the lid is in'position.

This mannerof manufacturing the boxes 7 this tool, the construction ofwhich forms,

the object of this invention.

This invention goes still further in that it provides a tool, which cutsout, draws and expands in one operation.

An embodiment of the invention is illustrated by way of examplein theaccompanying drawings in which:

Fig. 1 shows the tool in longitudinal section, the left side showing thetool in raised position and the right side in lowered position.

Fig. 2 shows a finished box drawn and set off in one operation. 7

Fig. 3 is a top plan view of the drawing die.

A. combined cutting and drawing tool, known per se, is constructed sothat a drawing ring 5 is built separately movable in a cutting die a.This ring I) is fastened on two bolts 0 and pressed down bysprings (Z.Further a drawing die 6 is composed of segments and made expandible.This is effected by a conical insert 7". During the downward movement ofthe upper part an ejector g presses in its lower position upon theconical insert 7', whereby the segment jaws of the drawing die 6 arepressed apart.

The operation is as follows:

upper part of the sheet metal is first cut out and drawn in the usualmanner. 'In its lowest position the ejector presses on theconical insertf, so that the segment jaws of the drawing die 6 expand and press thesidewall of the already finished drawn box over the ledge 71/ of thedrawing die 5, thus producing the set off edge on the tin box, Fig. 2.Dur- I ing the upward movement of the upper part the box is held in thecutting die a by resilient balls 'imounted around same and is ejected inknown manner in the extreme upper position by the ejecting'device 7c.

In this manner boxes of any shape and.

having a set off edge of any desired shape can be made by suitablyshaping the draw-' of said plunger and means for expanding saidsectional plunger whereby to expand a portion of the box. 7 I

2. A device as specified in claim 1 further. characterized by havingincombination cooperating cutting rings, a blank holder ring adapted tomove into and out of an annular channel surrounding said plunger, and aspring actuated ejector means moving in a central cavity of said die forautomatically ejecting the work. I

In testimony whereof I afiix my si nature.

FRIEDRICH EIsENLoH During the downward movement of the

